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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is a freezing cold winter month in Hartley, Iowa, with an average temperature ranging between max 22.8°F (-5.1°C) and min 9.9°F (-12.3°C). January, noted for its average high-temperature of 22.8°F (-5.1°C) and an average low-temperature of 9.9°F (-12.3°C), is considered the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Hartley, Iowa, with an average temperature varying between 13.5°F (-10.3°C) and 26.4°F (-3.1°C). The commencement of February records an average high-temperature of a still subzero cold 26.4°F (-3.1°C), barely varying from January's 22.8°F (-5.1°C). Weather in February »
Weather in March
The first month of the spring, March, is a cold month in Hartley, Iowa, with an average temperature ranging between max 42.4°F (5.8°C) and min 28.4°F (-2°C). As Hartley transitions into March, a noticeable rise in the average high-temperature is observed, soaring from a freezing cold 26.4°F (-3.1°C) in February to an icy 42.4°F (5.8°C). Weather in March »
Weather in April
April in Hartley, Iowa, is a refreshing spring month, with temperature in the range of an average low of 39.6°F (4.2°C) and an average high of 55.4°F (13°C). April's arrival brings a temperature shift, moving from a wintry 42.4°F (5.8°C) in March to a refreshing 55.4°F (13°C). Weather in April »
Weather in May
May, the last month of the spring in Hartley, is a refreshing month, with an average temperature varying between 51.3°F (10.7°C) and 67.6°F (19.8°C). A shift in the average high-temperature is noticeable in May, changing from a moderate 55.4°F (13°C) in April to a comfortable 67.6°F (19.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Hartley, Iowa, with temperature in the range of an average low of 61.2°F (16.2°C) and an average high of 77.4°F (25.2°C). With the transition into June, Hartley experiences an increase in average high-temperatures, moving up from a comfortable 67.6°F (19.8°C) in May to a warm 77.4°F (25.2°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Hartley, Iowa, with an average temperature varying between 80.2°F (26.8°C) and 63.1°F (17.3°C). July proves to be the warmest month, recording an average peak temperature of 80.2°F (26.8°C) and a minimum temperature of 63.1°F (17.3°C). Weather in July »
Weather in August
August, the last month of the summer in Hartley, is also a moderately hot month, with an average temperature ranging between min 59.9°F (15.5°C) and max 78.6°F (25.9°C). The average high-temperature for August is a still warm 78.6°F (25.9°C), closely aligning with the temperature of the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Hartley, is still a pleasant month, with temperature in the range of an average low of 53.8°F (12.1°C) and an average high of 73°F (22.8°C). The start of September comes with a small reduction in the average high-temperature, subtly receding from a warm 78.6°F (25.9°C) in August to an agreeable 73°F (22.8°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Hartley, Iowa, with temperature in the range of an average high of 57°F (13.9°C) and an average low of 41.9°F (5.5°C). The shift from September to October brings a noticeable decrease in the average high-temperature, dropping from an agreeable 73°F (22.8°C) to a moderate 57°F (13.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Hartley, Iowa, with temperature in the range of an average high of 43°F (6.1°C) and an average low of 29.7°F (-1.3°C). November brings a decrease in the average high-temperature, falling from October's refreshing 57°F (13.9°C) to a frosty 43°F (6.1°C). Weather in November »
Weather in December
December, the first month of the winter in Hartley, is still a freezing cold month, with an average temperature varying between 27.5°F (-2.5°C) and 16.5°F (-8.6°C). The changeover to December signals a significant decrease in the average high-temperature, dropping from a frosty 43°F (6.1°C) in November to a freezing cold 27.5°F (-2.5°C). Weather in December »
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
Hartley's January weather, with an average high temperature of 22.8°F (-5.1°C) and an average low temperature of 9.9°F (-12.3°C), tends to be the coldest of the year.
What is the most humid month?
With an average relative humidity of 88%, January is the most humid month.
What is the driest month?
The month with the least rainfall is January, when the rain falls for 2.5 days and typically collects 0.28" (7mm) of precipitation.
How much does it rain?
Throughout the year, there are 95.2 rainfall days, and 9.25" (235mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through May, October through December.
How many days does it snow?
Throughout the year, there are 40.2 snowfall days, and 5.79" (147mm) of snow is accumulated.
What is the month with the least sunshine in Hartley?
January has the least sunshine of the year, with an average of 4h of sunshine.
What are the months with the lowest UV index in Hartley?
The months with the lowest UV index are January, February and November, with an average maximum UV index of 1.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 8.9 days and accumulates 1.77" (45mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the wettest month?
May is the month with the most rainfall. Rain falls for 12.8 days and accumulates 1.46" (37mm) of precipitation.
When it does not snow in Hartley?
In Hartley, snow does not fall in June through September.
When are the longest days?
With an average of 15h and 18min of daylight, June has the longest days of the year.
What are the months with the highest UV index?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What part of the year is the hottest?
The highest temperatures are recorded in July, with averages reaching a high of 80.2°F (26.8°C) and a low of 63.1°F (17.3°C).
What month has the most sunshine?
The month with the most sunshine is July, with an average of 10.4h of sunshine.
What is the least humid month?
October is the least humid month, with an average relative humidity of 68%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 6min of daylight.
Average temperature
Hartley, IA
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (22.8°F).
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure
Hartley, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.15"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.99"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Hartley, IA
- Average wind speed in January:
11.1mph - Average wind speed in February:
11mph - Average wind speed in March:
10.9mph - Average wind speed in April:
11.2mph - Average wind speed in May:
9.8mph - Average wind speed in June:
8.8mph
- Average wind speed in July:
7.8mph - Average wind speed in August:
8mph - Average wind speed in September:
9.2mph - Average wind speed in October:
10.6mph - Average wind speed in November:
10.9mph - Average wind speed in December:
10.7mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity
Hartley, IA
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (68%).
Average rainfall
Hartley, IA
- Average rainfall in January:
0.28" - Average rainfall in February:
0.35" - Average rainfall in March:
0.59" - Average rainfall in April:
0.98" - Average rainfall in May:
1.46" - Average rainfall in June:
1.38"
- Average rainfall in July:
0.83" - Average rainfall in August:
1.02" - Average rainfall in September:
0.79" - Average rainfall in October:
0.67" - Average rainfall in November:
0.39" - Average rainfall in December:
0.51"
The wettest month (with the highest rainfall) is May (1.46").
The driest month (with the least rainfall) is January (0.28").
Average rainfall days
Hartley, IA
- Average rainfall days in January:
2.5 days - Average rainfall days in February:
2 days - Average rainfall days in March:
6.8 days - Average rainfall days in April:
11.6 days - Average rainfall days in May:
12.8 days - Average rainfall days in June:
14.2 days
- Average rainfall days in July:
11.4 days - Average rainfall days in August:
10.3 days - Average rainfall days in September:
9.2 days - Average rainfall days in October:
6.7 days - Average rainfall days in November:
4.5 days - Average rainfall days in December:
3.2 days
The month with the highest number of rainy days is June (14.2 days).
The month with the least rainy days is February (2 days).
Average snowfall
Hartley, IA
- Average snowfall in January:
1.22" - Average snowfall in February:
1.77" - Average snowfall in March:
0.91" - Average snowfall in April:
0.47" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Hartley, IA
- Average snowfall days in January:
9.4 days - Average snowfall days in February:
8.9 days - Average snowfall days in March:
5.7 days - Average snowfall days in April:
2.1 days - Average snowfall days in May:
0.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
1.4 days - Average snowfall days in November:
3.9 days - Average snowfall days in December:
8.5 days
The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Hartley, IA
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 4min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Hartley, IA
- Average sunshine days in January:
21 days - Average sunshine days in February:
18.8 days - Average sunshine days in March:
18.8 days - Average sunshine days in April:
14.9 days - Average sunshine days in May:
14.7 days - Average sunshine days in June:
12.6 days
- Average sunshine days in July:
16.1 days - Average sunshine days in August:
16.8 days - Average sunshine days in September:
18.5 days - Average sunshine days in October:
20.7 days - Average sunshine days in November:
21.6 days - Average sunshine days in December:
22.2 days
The month with the most sunshine days is December (22.2 days).
The month with the least sunshine days is June (12.6 days).
Average UV index
Hartley, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover
Hartley, IA
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility
Hartley, IA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Hartley, Iowa, USA
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